In days past, the tools you needed weren't available commercially. You had to make what you need. During my 2yrs getting formal training at MCC, we made many tools. Many were "required" to pass the basic machine shop semester. Barrel vise, action wrench, heat sinks for bolt handle welding, guide pins and "T" handled screws for stockmaking, the list was long, 50 'required' tools in all. 30yrs later, I still use many of them, and have made many more for specific tasks. These days, you can get on the web and buy what it is you might want. Good or bad, that's debatable. On one hand, your time has to be worth something. On the other, designing and making what you need can carry over as 'precious experience' to another task you encounter. There is no real "end" to learning.